/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2004-2013 The University of Tennessee and The University
 *                         of Tennessee Research Foundation.  All rights
 *                         reserved.
 * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
 *                         University of Stuttgart.  All rights reserved.
 * Copyright (c) 2004-2005 The Regents of the University of California.
 *                         All rights reserved.
 * Copyright (c) 2012-2013 Inria.  All rights reserved.
 * Copyright (c) 2014      Research Organization for Information Science
 *                         and Technology (RIST). All rights reserved.
 * $COPYRIGHT$
 *
 * Additional copyrights may follow
 *
 * $HEADER$
 */

#include "ompi_config.h"

#include <stdio.h>
#include <stdlib.h>

#include "opal/class/opal_list.h"
#include "opal/util/output.h"
#include "ompi/mca/mca.h"
#include "opal/mca/base/base.h"
#include "opal/mca/base/mca_base_component_repository.h"
#include "ompi/mca/topo/topo.h"
#include "ompi/mca/topo/base/base.h"
#include "ompi/constants.h"

static int init_query(const mca_base_component_t *m,
                      mca_base_component_list_item_t *entry,
                      bool enable_progress_threads,
                      bool enable_mpi_threads);
static int init_query_2_2_0(const mca_base_component_t *component,
                            mca_base_component_list_item_t *entry,
                            bool enable_progress_threads,
                            bool enable_mpi_threads);

int mca_topo_base_find_available(bool enable_progress_threads,
                                 bool enable_mpi_threads)
{
    opal_list_item_t *item, *next;
    mca_base_component_list_item_t *cli;

    /* The list of components which we should check is already present
       in ompi_topo_base_framework.framework_components, which was established in
       mca_topo_base_open */

    item = opal_list_get_first(&ompi_topo_base_framework.framework_components);
    while (item != opal_list_get_end(&ompi_topo_base_framework.framework_components)) {
        next = opal_list_get_next(item);
         cli = (mca_base_component_list_item_t*)item;

         /* Now for this entry, we have to determine the thread level. Call
            a subroutine to do the job for us */

         if (OMPI_SUCCESS != init_query(cli->cli_component, cli,
                                        enable_progress_threads,
                                        enable_mpi_threads)) {
             /* The component does not want to run, so close it. Its close()
                has already been invoked. Close it out of the DSO repository
                (if it is there in the repository) */
             mca_base_component_repository_release(cli->cli_component);
             opal_list_remove_item(&ompi_topo_base_framework.framework_components, item);
             OBJ_RELEASE(item);
         }
         item = next;
     }

     /* There should at least be one topo component available */
    if (0 == opal_list_get_size(&ompi_topo_base_framework.framework_components)) {
         opal_output_verbose (10, ompi_topo_base_framework.framework_output,
                              "topo:find_available: no topo components available!");
         return OMPI_ERROR;
     }

    /* All done */
    return OMPI_SUCCESS;
}


static int init_query(const mca_base_component_t *m,
                      mca_base_component_list_item_t *entry,
                      bool enable_progress_threads,
                      bool enable_mpi_threads)
{
    int ret;

    opal_output_verbose(10, ompi_topo_base_framework.framework_output,
                        "topo:find_available: querying topo component %s",
                        m->mca_component_name);

    /* This component has been successfully opened, now try to query
       it and see if it wants to run in this job.  Nothing interesting
       happened in the topo framework before v2.2.0, so don't bother
       supporting anything before then. */
    if (2 == m->mca_type_major_version &&
        2 == m->mca_type_minor_version &&
        0 == m->mca_type_release_version) {
        ret = init_query_2_2_0(m, entry, enable_progress_threads,
                               enable_mpi_threads);
    } else {
        /* unrecognised API version */
        opal_output_verbose(10, ompi_topo_base_framework.framework_output,
                            "topo:find_available:unrecognised topo API version (%d.%d.%d)",
                            m->mca_type_major_version,
                            m->mca_type_minor_version,
                            m->mca_type_release_version);
        return OMPI_ERROR;
    }

    /* Query done -- look at return value to see what happened */
    if (OMPI_SUCCESS != ret) {
        opal_output_verbose(10, ompi_topo_base_framework.framework_output,
                            "topo:find_available topo component %s is not available",
                            m->mca_component_name);
        if (NULL != m->mca_close_component) {
            m->mca_close_component();
        }
    } else {
        opal_output_verbose(10, ompi_topo_base_framework.framework_output,
                            "topo:find_avalable: topo component %s is available",
                            m->mca_component_name);

    }

    /* All done */
    return ret;
}


static int init_query_2_2_0(const mca_base_component_t *component,
                            mca_base_component_list_item_t *entry,
                            bool enable_progress_threads,
                            bool enable_mpi_threads)
{
    mca_topo_base_component_2_2_0_t *topo =
        (mca_topo_base_component_2_2_0_t *) component;

    return topo->topoc_init_query(enable_progress_threads,
                                  enable_mpi_threads);
}
